Kinetograph movement



G. 'A. MITCHELL.

KINETOGRAPH MOVEMENT.

APPLICATION FILED MAYI2.1920.

mmsfia Emma mm, 1922..

2 SHEETS SHEET 1.

G. A. MITCHELL.

KINETOGRAPH MOVEMENT.

APPLICATION FILED MAY)? I920. QUS,3SQD Patented Jan. W, 1922.

2 SHEETS-SHEET 2.

in synchronism with the film moving mech-.

holding the film 17 against movement is so that it can be positively held still at times when it is being exposed and is not being moved by the film moving, or advancing, mechanism.

In order to operate the gate carrier 19 anism hereinafter described, or to clamp the film 17 at suitable and proper times, a projection or arm 25 extends rearwardly from one side of the carrier 19 and has extending from it a pin 26 which carries a roller 26 carried in a cam groove 27 formed in a disk 28. The disk 28 is mounted ona suitable drive shaft 29. The drive shaft 29 is supportedvby a suitable ball-bearing 30, carried by the wall 11, and a suitable ball-bearing 31, carried at the outer end of a housing 32 which is mounted on, and which extends outwardly from, the wall 11, as clearly shown in the drawings. Anysuitable or ordinary drive may be provided for the drive shaft 29; for instance, a gear 33 may be mounted on the outer end of the shaft to mesh with and be driven by a gear (not shown). The shaft 29 is held against longitudinal displacement. or movement, by a cone or annular protection 34 formed on it to en age the balls of. bearings 30, and a cone screw threaded on its outer end to engage the balls of bearings 31. The cone 35 being screwed threaded on the shaft 29 v is adjustable longitudinally relative to the shaft thereby making it possible to set the shaft so that it will have only the necessary amount of longitudinal play.

The cam groove 27, in the disk 28,-has two' portions, A and B. each of which is concentrio with the disk 28 and shaft 29. The portion B of cam groove 27 is formed on a slightly greater radius than the section A and is somewhat longer than section A. The two sections A and B of the groove 27 are connected so that the groove is continuous and to allow free passage of the roller 26 from one section to the other. When the disk 28 is in a position which causes the roller 26 to be in portion A, of the groove 27, the carrier 19 is in its out position which allows the film 17 to be moved between the aperture plate 13, and the film gate 18, while when the roller 26 is in portion'B of cam groove 27 the carrier 19 is in its in position which causes the film 17 to be firmly clamped between the aperture plate 13 and the film gate 18.

To move or advance the film 17, between the carrier 19 and film gate 18 at times when it is not clamped or held between the film gate 18 and aperture plate 13, two clawsor pins 38 are carried by an arm 41. The pins 38 are of proper size and are so spaced as to properly fit the perforations or apertures provided in standard moving picture film, and are arranged to extend through vertical slots 40 in the gate 18 in order to engage the film, as shown in the drawings. The pins 38 are carried at the ends of a cross arm 41 arranged at the end of guide 42. Guides 42 and 42 extend from opposite sides of cam guide 47 and are slidably carried in apertures 43 and 4:4 in frame 45. .The frame 4-5 is carried by suitable vertical guides, and is formed with a recess 46 between the portions in which the guide carrying apertures are formed in order to carry or receive the cam guide 47 which is formed with opposite faces 48 and 419 between which are carried the cam 50. The walls 80 and 81 of recess 4L6 form supports or guides for the cam .guide 47 while the walls 82 and 83 of the recess 46 are spaced apart so that they will not interfere with the movement of cam guide 47 caused by cam 50. The walls or faces {l8 and 41-9 of the cam guide 47 are vertical and parallel with each other and are spaced apart toaccurately receive the cam 50. The cam 50 is the horizontal movement cam and is mounted on the inner end of the shaft 29, being secured thereon by a suitable screw 51.. Further, the cam 50 is so shaped and is so mounted on the shaft 29 that when the shaft'is rotated it causes movement of the pins 38 into engagement with the film just before the frame 45 starts to move down, causes the pins to remain in engagement v'ith the film during the downward movement of the frame, causes the pins to be withdrawn from the film when the frame reaches the bottom of its movement, and causes the pins to remain withdrawn from the film during the upward movement of the frame. The cam 50 and the dislt 28 are mounted on the shaft 29 in such relative povlit? sitions as to cause the pins and film gate to co-operate so that the film is released by the gate immediately after it is engaged by the pins, so that the film remains released and. free to move while the pins are moved downwardly with frame 45, so that the film is clamped or held after the frame has reached the bottom of its movement and just before the pins are withdrawn from The up and down or vertical movement of frame 45 above referred to is caused by a, cam 55 mounted on shaft 29- between disk 28 and cam 50. The cam 55 is arranged to be between and to engage parallel horizontal guide surfaces 56 and 57 formed on frame 45 and it is so shaped and positioned on vfilml'i' to be advanced a distance equal tn ii if e Awe ment;

pictureeach time shaft 39 makes a revolution.

It will be particularly noted in the draw.- that the cams are .all simple in conuction and extremely compact in arrangeand it will be readily understood how they can be shaped and proportioned so that the mechanism will operate easily, smoothly and effectively. I The disk 28, cam 5b. and cam may be keyed to shaft 29 suitable key 90. and may be clamped or held gether on the shaft 29 by the screw 51. in practice it is desirable to construct soul of the parts so that they will be com paratively light. This may be very effectively done by forming holes and recesses in them at suitable places. For instance, the frame may be formed with holes 95 and the cam may be recessed at 96. Furthcr it will be understood how the timing of the various movements or functions of, the machine may be varied or changed by varying the shapes, sizes, or relative positions of the cams.

Any suitable means may be employed for guidiiu the frame 45 vertically. For'instance, as shown in the drawings the frame may be formed with two suitably spaced ver-. tical bores which slidably receive two vertical guide rods '61. The guide, rods are carried between horizontal disposed flanges (32 and (53 extending from a bracket 64 mounted on the inner face of wall 11 by screws v Having herein set forth a preferred form of my invention 1 do not wish to limit 'myself to the particular details set forth but wishto reserve to myself any changes or variations that may appear to those skilled in the art or that may fall Within the scope of the following claims.

Having described a preferred form of my invention, I claim:

l. A film moving mechanism comprising a vertically movable frame, a horizontally movable film engaging member carried by the frame, a film clamping member, 'arotating shaft, and three separate cams mounted on the shaft, one of the cams causing reciprocation of the frame, one causing reciprocation of the film engaging member, and one causing operation of the filmclamping member.

2. A film moving mechanism comprising, a vertically movable frame, a horizontally movable film engaging member carried by the frame, a film clamping member, a rotating shaft, and three separate cams mounted on the shaft, one causing reciprocatory movement of the frame, one causing movement of the film engaging member into engagement with the film at one end of the frame movement andout of engagement with the film at the other end of the frame movement, and the other positively holding the film clamping member out .of engagement with the film when the film engaging member is in engagement with it and positively holding the film clamping member in clamping engagement with the film when the film engaging member isout of engagement with it. In witness that I claim the foregoing I have hereunto subscribed my name this 7th day of May, 1920.

GEORGE A. MITCHELL. 'Witness:

E. D. CAVENDER. 

